摘要
为探究静稳条件下PM_(2.5)局地源累积特征,在石嘴山市的4个不同功能区站点采集PM_(2.5)样品,并测量其水溶性离子、无机元素和含碳组分浓度,利用后向轨迹模型判断潜在源区,分析了静稳期和非静稳期PM_(2.5)组分浓度差异,并采用PMF模型判断静稳期局地源排放特征。结果表明:(1)观测期间有2次重污染过程是由局地污染物累积引起的;(2)沙尘源为主要的外来源,冬季非静稳期存在Si、Ca、Fe浓度大幅上升现象(浓度达到15.11、27.03、18.89μg/m^(3)),水溶性离子易在静稳条件下累积,受采暖影响,NO_(3)^(-)、SO_(4)^(2-)在冬季有更大的贡献,NO_(3)^(-)/SO_(4)^(2-)的值表明秋季机动车源对PM_(2.5)的贡献较大,冬季燃煤源对PM_(2.5)的贡献较大,OC/EC的值表明局地排放二次有机气溶胶转化效率不强;(3)静稳条件下受局地源影响,太沙站点S、Mn、SO_(4)^(2-)、EC等与工业排放相关的组分浓度最高,沟口站点受机动车源的影响,NO_(3)^(-)浓度最高(22.66μg/m^(3)),崇岗站点受煤炭加工排放影响,OC浓度远高于其他站点;(4)PMF模型解析结果显示,石嘴山市局地源中工业源(47.4%)贡献最大,其次为机动车与扬尘混合源(29.3%)、二次源(15.1%)。
In order to explore the accumulation characteristics of PM_(2.5) local sources under calm weather,PM_(2.5) samples were collected from four stations located in different functional areas of Shizuishan City,and the concentrations of water-soluble ions,inorganic elements and carbon components were measured.The potential source area was determined by backward trajectory model,the concentration difference of PM_(2.5) components in calm period and non-calm period was analyzed,and the PMF model was used to judge the characteristics of local source emissions in calm periods.The results showed that:During the observation period,two heavy pollution processes were caused by local pollutant accumulation;Sand-dust source was the main external source,and the concentrations of Si,Ca and Fe increased sharply in the non-calm period in winter,reaching 15.11,27.03 and 18.89μg/m^(3).Water-soluble ions were easy to accumulate under calm weather,and affected by heating,NO_(3)^(-) and SO_(4)^(2-) had a greater contribution in winter.NO_(3)^(-)/SO_(4)^(2-) analysis showed that the contribution of motor vehicle sources to PM_(2.5) was greater in autumn,and the contribution of coal sources to PM_(2.5) was greater in winter.OC/EC showed that the aerosol conversion efficiency of local emission secondary machine was not strong;Under the influence of local source,the concentration of industrial emission related components such as S,Mn,SO_(4)^(2-) and EC at Taisha station was the highest;Goukou station affected by motor vehicle source,the NO_(3)^(-) concentration was the highest,which was 22.66μg/m^(3);Under the influence of coal processing emission,the OC concentration at Chonggang station was much higher than that at other stations;The analytical results of PMF model showed that among the local sources of Shizuishan City,the industrial source(47.4%)contributed the most,followed by the mixed source of motor vehicles and dust(29.3%)and the secondary source(15.1%).
作者
陈引
赵欣
漆丹
杨帆
陆建刚
CHEN Yin;ZHAO Xin;QI Dan;YANG Fan;LU Jiangang(Collaborative Innovation Center of Atmospheric Environment and Equipment Technology,Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control,School of Environmental Science and Engineering,Nanjing University of Information Science&Technology,Nanjing 210044,China;Nanjing Institute of Environmental Sciences,Ministry of Ecology and Environment,Nanjing 210042,China)
出处
《中国环境监测》
CAS
CSCD
北大核心
2024年第3期71-83,共13页
Environmental Monitoring in China
基金
国家重点研发计划项目(2019YFC1804200)。
